用西北地区140个气象站1971～2000年的春季降水、蒸发资料，计算了一种K干旱指数，并制定了干旱标准，分析了西北春季干旱的气候特征。
A kind of K drought index and its criterion are made by using spring precipitation and evaporation data of 140 stations in Northwest China from 1971-2000.
用西北地区140个气象站1971～2000年的春季降水、蒸发资料，计算了一种K干旱指数，并制定了干旱标准，分析了西北春季干旱的气候特征。
A kind of K drought index and its criterion are made by using spring precipitation and evaporation data of 140 stations in Northwest China from 1971-2000.
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